我国非晶合金变压器技术调研分析报告

非晶合金铁心变压器是用新型导磁材料——非晶合金制作铁心而成的变压器,它比硅钢片作铁心变压器的空载损耗下降75%左右,空载电流下降     

非晶态铁心变压器制造和应用综述

用新型超低损耗铁心材料制成的非晶态铁心变压器，因其空载损耗极低、节电效果显著，引起变压器制造、电力行业的高度重视。文中从非晶态材料和变压器的研究、制造、应用几方面，概要介绍了国内外的现状。指出这种变压器的应用前景，并对从国外引进全套技术和推广使用的技术政策提出了建议。     

非晶合金铁心变压器的特点分析

非晶合金应用于电力变压器,将会成为一种能够大幅度降低变压器空载损耗的节能材料,介绍了非晶合金材料的优缺点,并对非晶合金铁心变压器与硅钢片铁心变压器的性能进行了分析比较,为研制非晶合金铁心变压器提供了参考。     

一种新型可降低硅钢片用量的铁心叠装技术

介绍一种新型变压器铁心叠装技术,可以有效降低变压器铁心材料消耗。     

变压器铁心磁通和损耗分布的有限元分析

本文采用有限元法分析计算变压器铁心中各向异性非线性磁场,提出材料各向异性的对称牛顿-拉夫逊法和损耗计算的综合技术,对影响变压器铁心结构系数的诸多因素进行了详细的研究。     

非晶合金变压器铁心材料的安装优化设计

在输配电网中所使用的配电变压器多为冷轧取向硅钢片铁心励磁变压器,但在使用过程中经常发生较大待机功耗.非晶合金励磁配电变压器主要采用非晶态合金铁心材料作为非晶合金铁心励磁变压器的材料,与市场上采用硅钢片合金铁心制造的励磁配电变压器相比,其产生的空载励磁损耗大为降低.本文通过改选SBH15-315/10型变压器的线圈匝数和...     

影响变压器空载损耗的铁心叠片结构改进

变压器的空载损耗主要包括铁心的磁滞损耗、涡流损耗和铁心附加损耗,影响空载损耗的原因包括叠片的材料与性能、硅钢片之间绝缘性能、叠片的剪切方式和叠积方式等。通过在铁心设计和叠片结构工艺制造上采取相应措施,提高材料的利用率,降低铁心的附加损耗,提高了变压器的空载性能。     

高功率脉冲变压器铁心的研究

本文针对用于磁脉冲压缩器中的高功率脉冲变压器铁心问题,探讨了它的结构参数及其材料选择原则,为设计打下良好基础,同时也为研究其它脉冲变压器和磁开关的铁心提供参考。     

基于高频材料特性分析的旋转式松耦合变压器结构设计

为提高旋转变压器耦合性能、减小铁心尺寸,该文提出一种以纳米晶带材为铁心材料的新型旋转式松耦合变压器,用来为旋转设备供电。基于实验室现有的高频磁特性测量系统,测量并分析了正弦波和方波激励下软磁铁氧体与纳米晶带材的磁特性。尝试采用纳米晶带材替代块状铁氧体做旋转式松耦合变压器铁心材料,由于铁心材料形状的改变,传统罐式旋转式松耦合变压器结构不再适用于纳米晶铁心,该文提出两种新型结构的旋转式松耦合变压器。基于磁场数值仿真平台,分析了这两种旋转式松耦合变压器在实际工况下的瞬态特性,计算了耦合系数和铁心损耗,讨论了上述旋转式松耦合变压器铁心结构及相应的绕组结构的可行性,为旋转式松耦合变压器的性能提升提供一个新的思路。     

受工艺孔影响的变压器铁心损耗计算与分析

变压器的工艺堆叠孔会增加铁心损耗,导致变压器局部温升,甚至影响变压器正常运行。为了研究工艺孔对变压器铁心损耗及其性能的影响,该文对硅钢材料的双向交变磁特性与损耗特性进行测量与分析,结合Steinmetz损耗计算公式对带工艺孔的铁心模型进行二维磁场解析计算,提出由不同形状、尺寸工艺孔造成铁心损耗增长的理论计算方法,基于有限元法对变压器铁心常用的取向硅钢片进行二维瞬态磁场仿真计算,对比分析了不同类型工艺孔对变压器铁心损耗的影响。构建带工艺孔的硅钢样片损耗测试平台,定量测试铁心材料由工艺孔造成的损耗以及局部温升,验证理论计算方法的有效性与准确性。仿真及实验结果表明,提出的变压器工艺孔铁心损耗增长的计算方法具有较高的计算精度和工程适用性。     

开关电源变压器及其磁芯的发展

简单介绍了开关电源技术的发展情况,报导了有关变压器及其磁芯设计开发的亲成果。最后,介绍了高频低功耗失氧体及新材料的开发。     

高压大型电力变压器冷却系统的改造

回顾了变压器冷却系统的发展过程，提出了高压大型电力变压器冷却系统改造的必要性，给出了变压器冷却系统的改造实例。     

Amorphous Alloys for Distribution Transformers: Design Considerations and Economic Impact

The use of amorphous ferromagnetic materials for the magnetic circuits of distribution transformers could reduce the losses associated with iron cores and result in substantial economic savings to utilities. The value of such savings obviously depends on the loss evaluation. Optimization calculations show that this value varies according to the transformer design. A comparative performance evaluation revealed the advantages and shortcomings of four different transformer designs and of different types of steel used to build the magnetic circuits. The paper finally gives a few design details of a pre-prototype distribution transformer, developed at IREQ, which has an amorphous-alloy magnetic circuit.     

On the development of a core for a low-power transformer on a basic of wasteless technology

Innovations in critical technology for the production of magnetic materials is considered. On the basis of these innovations, a new design of a low-power transformer is proposed. The operating characteristics of transformers of the pilot and analog design are studied.     

油浸变压器用植物油

在ll篇文献的基础上，综述了变压器用绝缘植物油的研究现状，分析比较了植物油和矿物油的特性，指出了植物油绝缘的诸多优点和变压器用植物油存在的问题。得出植物油其生物降解率高，符合环保要求，具有良好的应用前景的结论。     

Core lamination selection for distribution transformers based on sensitivity analysis

In this paper, the sensitivity analysis is used to select the core lamination thickness of single-phase distribution transformers rated from 5 to 50 kVA. Three different magnetic materials (M2, M3 and M4) with thicknesses of 0.18, 0.23 and 0.27 mm are considered. Transformer designs are compared based on the total owning cost as well as on the transformer bid price. The impact of the different laminations on total owning cost and bid price is calculated for a total of 144 transformers (72 for each criterion). All transformers fulfill all the operating and construction constraints. The paper considers the impact on core losses of the space factor (core-assembling pressure) and of the building factor and also describes how core losses are affected by core design parameters such as the number of laminations per step, air gap and overlap. It is concluded that for the analyzed power range, M3 lamination is the best choice since all of the studied cases have smaller bid price and 79% of the studied cases have lower total owning cost. This paper gives guidelines to select the appropriate thickness and can help transformer manufacturers to select the optimal thickness for distribution transformers.     

电力变压器励磁涌流和故障电流仿真研究

在研究电力变压器励磁涌流和故障电流特性的基础上 ,应用电磁暂态程序 (EMTP) ,采用不同的模型和方法对变压器励磁涌流和故障电流进行了全面系统的仿真计算和分析。结果表明 ,EMTP能够根据不同的条件和要求有效地实现对变压器励磁涌流和故障电流的仿真     

Influence of electrical insulation on design and performance ofpower equipment

The potential impact of research and development on new dielectric materials on high-voltage designs for transformers, capacitors, generators, and SF₆-insulated equipment is reviewed in the context of limitations imposed by present tests and material properties. The potential technical and economic benefits of new dielectric systems are described and directions indicated for future research and development. The following impacts on power equipment are anticipated: improved reliability, electrical performance and economics of most systems, improved mechanical performance of generators and transformers, improved thermal rating of transformers and cables, and a positive environmental impact for transformers and capacitors     

Mathematical models for current, voltage, and coupling capacitorvoltage transformers

This paper reviews a number of mathematical models used to represent the nonlinear behavior of the magnetic core of instrument transformers. Models of instrument transformers using these core representations are presented. The transient response of the instrument transformer is compared to actual test results recorded in the laboratory. The paper provides practical guidelines as to which of the physical elements of instrument transformers are important to model during transient studies and which elements could be ignored without sacrificing the accuracy of the simulation results. The electromagnetic transients program (EMTP) data files used to generate the models are also provided in the appendix to help new EMTP users model instrument transformers for evaluation of high-speed protective relaying systems     

计及谐波的J-A磁滞模型修正

J-A磁滞理论被广泛应用于电磁式电流互感器的磁特性建模,但是在谐波条件下该模型存在较大的误差。针对这一问题,文中对各次谐波分别修正经典J-A模型参数,利用遗传退火算法进行参数辨识,然后将各次谐波的磁特性进行线性叠加,实现非正弦激励下电流互感器的磁特性建模。采用该修正方法的前提是计量用电流互感器的非线性误差符合规定的0.2S级,因此对各次谐波磁滞回线的仿真分析与误差修正均近似适用于线性叠加原理。以采用纳米晶材料的0.2S级电流互感器为例,对角差与比差进行仿真分析与实验验证,结果表明经过参数修正的J-A模型改善了谐波条件下的测量准确度,多次谐波磁特性的近似线性叠加方法对测量准确度的影响可以忽略不计,从而确认计及谐波的J-A磁滞模型修正合理有效。